Yeah, but they're cheap and basically trivial to use. Cheap enough and trivial enough that they can replace solenoids in a lot of use cases.

One of my most amusing applications was the client who put an R/C servo on the choke cable of a carbureted generator motor instead of spending more money to buy the fuel-injected version. Servo cost about $5 and we were already measuring air temperature and had a PWM output available.